Townshend Springs under Speakers

Doppler….it’s simple…

 if F=MA explained the whole universe, what a boring place it would be. Somebody skipped a few lessons…

the 7 weighs less than the 225# 5a, yet has better cabinet performance…because somebody didn’t just sit on laurels… It incorporates advances in science and materials. I can hear it having owned both the 5a and the 7.  

Also the main but not sole source of vibration energy in the 5a and first 2 model 7’s is the 12” dual voice coil push pull driver….wait for it… aligned vertically…..Let me know when the 1812 cannon shot levitates that 225# 5a, or pins it to the floor. Tell me where the lever is again ? Like i said before, the Kento and new 7 extreme use force cancellation drivers ….mounted very low in the cabinet…

All Vandy speakers come w 3 spike attachment points including String’s 5a, i assume he is using them.

Bedrock came about in a creative collaboration with Helmut Brinkmann ( ya that guy ) at the Munich show. 

All this isn't new…good speaker designers from a host of cutting edge firms which come to mind are trying to build lower resonant cabinets that don’t reflect energy back into the drivers…

and some like Harbeth build superb sounding kit despite it…

Finally, measure and listen… tools for measuring the cabinet radiated and stored energy release ( think that thru )  are widely available and frankly inexpensive, ditto access to a laser scanner to see what a cone or panel is doing relative to the input signal….

Excuse me while i go listen to my Quads….the BBC  has a lecture on …..quantum physics…I am wondering why a genius like Peter Walker would emulate a point source on a planer driver….it probably has something to do with …..F

For the DIY crowd, Bedrock could be somewhat duplicated w Granite, some thoughtful milling and Green Glue or another constrained layer elastomer of your choice….

carry on, enjoy your music, springs, etc !,,,,

@roxy54, 
I've had the Star Sound  Apprentice platforms beneath the speakers and every audio component for the last 6 or 7 years. 
Charles 

i don’t think you can generalize what is an ideal speaker-floor interface method across all speaker types and floor types; that is a mistake.

how my 750 pound each (x4), twin tower, Evolution Acoustic MM7’s work on 6 inches of concrete is different than a speaker half or less weight on a suspended wood floor. then take that smaller, lighter, speaker and add multiple subwoofers to it.

that smaller speaker on the trampoline of a suspended wood floor being also energized by a bunch of subs will likely get a net benefit from the extreme decoupling of the Townshend springs. then consider the cabinet build quality at particular price points and that is another factor favoring extreme decoupling.

my MM7’s are over-built with 2000 layers of baltic birch and pressed together by a 6 ton press. you have 750 pounds of mass and a concrete floor. i still use Wave Kinetic 2NS speaker decoupling footers for a small degree of decoupling which does eliminate smear.

http://www.chambersaudio.com/product/wave-kinetics-2ns-loudspeaker-interface-system/?doing_wp_cron=1...

horses for courses.

passive resonance treatments are very much a matter of context. one size does not fit all.

btw; my speakers are voiced using the 2NS footers on a concrete floor. i have visited my speaker builder multiple times. he set up my speakers in my room.

Charles,
That’s great. They’re really amazing. I don’t know if you’re aware of these, but a couple of years ago, Robert suggested that I night add the APCD4-Inverts between the upward facing cones and the speaker bottoms. I got them, and it not only improves the effect, but it prevents further damage to the speaker bottoms and makes small placement adjustments so easy.
John
Audio Points™ by Star Sound Technologies

It’s simple to understand and it was understood in the 80s buy two prominent speaker builders at the time, Carver, and VMPS.

They both understood that cabinet resonance transferred to a common medium will induces a third passive driver. There is no way to USE the signal without introducing a serious timing issue between the air being pushed from the drivers, vs the arrival time of the floor, walls. and ceiling. The floor is quicker..

Smearing happens by funneling all the different frequencies into ONE common medium, (via spikes)

What I learned from Brian Cheney and Bob Carver is the term BASS cohesion. The second is BASS propagation

The signals that were being transferred to the floor are now stopped.
They decouple, easy fix. BUT we don't raise it to much because of bass LOSS, WHY? Bass uses boundaries to GROW or propagate. YOU will hear the bass from that speaker go DOWN in volume, ACTUAL volume..

Cabinets do not move if they are made for one thing BASS.

The monitors can’t move because they weigh 425 lbs each and the BASS is in a different cabinet..

We help a CABINET dissipate the vibration a few ways. No bass in the monitor cabinet and narrow the baffle face to reduce the collection point for second hand bass.

In the bass cabinets use sound coat to reduce resonance issues THICH walls of MDF and bracing to reduce any panel lengths over 8". The cabinet is MADE for bass, not every frequency on the planet...

Pods, Springs, Air ride or a good sand pit the SUB cabinets. (I'm using OB servos by GR)
Pods, Springs and or air ride the Mid Bass Cabinets. My MB LS Columns
Pods, Springs and or air ride the Monitor cabinets. VMPS Elixirs..

Dear Mr. Richard Vandersteen, Spikes?

With great respect and regard